There's no compelling reason, as far as I know, to run more than one stack 
with the progress that has been made.  IBM recommends that you do not. 
There's a set of four very good redbooks on TCP/IIP Implementation, 
SG24-7798-00 through SG24-7801-00.   I have leaned on them heavily 
recently, especially the fourth volume on security and policy based 
networking.  Recently we collapsed a couple of dual stack systems down to 
one because of the improved flexibility possible in the IP filtering.  We 
were able to restrict access to certain endpoints while letting general 
traffic flow and that was not something we figured out how to do with the 
stack based filters. 

I am crabbing about having to set up NSS to get IKEv2 and trust chains 
when I only have one sysplex involved (passtickets, AT-TLS etc etc) but 
that's another issue. 

Thomas Ambros
Operating Systems and Connectivity Engineering
518-436-6433

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